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| Plate 51 Giardia lamblia (left) trophozoite and cyst seen in stool specimen. At the right, the characteristic features of the cyst are revealed more clearly (×1,000). |
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| Plate 52 Plasmodium trophozoites in red blood cells (arrows). P. vivax at left causes the blood cell to enlarge and show characteristic stippling (Schüffner’s dots). At right, three trophozoites (ring forms) of P. falciparum in a single red blood cell. Multiply infected cells are characteristic of this malarial species; the infected cell is not enlarged and no Schüffner’s dots are present. |
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| Plate 53 Cryptosporidium spp. are prevalent in animals but also infect humans, causing massive, watery diarrhea. Diagnosis can be made by finding oocysts in the patient’s fecal specimen, either with a modified acid-fast stain (circular red objects, left) or with a specific fluorescent antibody reagent (circular green objects, right). |
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| Plate 54 Characteristic egg of the fish tapeworm, Diphyllobothrium latum, ×400. Larvae in raw or undercooked fish mature to adulthood in the human intestinal tract and shed eggs that help provide the diagnosis. |
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| Plate 55 Echinococcus granulosus cyst from human liver. More than 12 larval forms of Echinococcus can be seen budding off from the thickwalled capsule. |
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